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Differences in programming style: grcpool is object-oriented, my pool is procedural.
grcpool has a lot more users, steady rewarding, scalability, better hardware, SPARC support, 2FA, nice web design, poll support, video instructions, well-tested by users, develops more time.
Mine is has only basic functions. Easier to understand, check or change something. Also I could change global project settings for users of my pool, at least while I have a few users.
Also this is only alternative currently. Until manual reward claim implemented.

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